GeekLog, yes, Gallery, no. Gallery is a very CPU intensive script. Gallery 2.1 has made big bounds with its reworking of caching and thumbnailing, but it can still hit hard. You may want to look into disabling any plugins you don’t need, and look into making sure the cache is enabled and working properly.
If GeekLog has a cache addon, grab it too.
You might also search the wiki for instructions to set up FastCGI for your entire site, which should help with CPU usage all around.
Best of luck.